Embedded C Developer OpenSync/OpenWrt

Job Title: Embedded C Developer – OpenSync/OpenWrt WiFi Router with Cellular

Strong proficiency in C programming — pointers, memory management, IPC, event-driven architectures. Experience with OpenWrt build system, package management, UCI configuration, and JFFS2/SquashFS overlay filesystems. Familiarity with OpenSync or similar cloud-managed CPE frameworks (OVSDB, protobuf, MQTT telemetry).Experience with cellular modem integration — AT commands, QMI, network interface management (rmnet/wwan).Strong understanding of Linux networking — routing tables, metrics, netfilter, bridge interfaces, IPv4 and IPv6 dual-stack, neighbor discovery, DHCPv4/DHCPv6, SLAAC, and prefix delegation. Understanding of TLS handshake with mutual authentication using X.509 certificates, certificate chain validation, and secure provisioning. Knowledge of security and tunneling protocols — GRE tunneling, IPsec, VPN overlays, and secure encapsulation for cloud-managed traffic. Experience with event loop frameworks (libev, libuv, or similar).Proficiency with debugging tools — GDB, strace, tcpdump, kernel logs, serial console. Familiarity with Git, GitLab CI/CD, cross-compilation toolchains. Understanding of WiFi standards (802.11ax/be) and wireless driver configuration. Top Skills: Embedded C Development on Linux/Open WrtC programming, Linux internals, debugging, IPC, event-driven design Open Sync/OpenWrt Platform Development Open Sync Managers, OVSDB, UCI, MQTT, Open Wrt build system Linux Networking & LTE/5G Cellular Integration Routing, IPv4/IPv6, failover, QMI/MBIM, modem management, GRE/IPsec